Yup, so have I. Don't get me wrong, I wasn't having a massive go at Giles. But there was obviously a weakness there that Munster exploited on more than one occasion. Despite having strong games, the Munster wingers aren't exactly of the caliber of Haylett-Petty etc. so he may have gotten more exposed at international level. As you say, Halfpenny would have protected him better, but the fullback can't be everywhere, so the wingers need to be up to the job.
Saying that, North and Cuthbert have been similarly caught out in the past. So maybe I'm being too critical. The difference I see it is that North etc. have the experience to shrug off a mistake; whereas a young man making his debut could affect him far worse.
If the choice was Cuthbert or Giles, I may well have plumped for Giles. But with Tom James, Amos and Walker all playing well, there were other good options before Giles. Still shows that it was a poor decision by Howley imo to select Cuthbert.